Bunn Coffee Maker CDBC-TWIN-APS Service Manual

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CAUT

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CDBC TWIN

CDBCF TWIN

CDBC TWIN APS

CDBCF TWIN APS

DISCONTINUED VERSION

The information in this manual

is no longer current.

OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: (217) 529-6601 FAX: (217) 529-6644

To ensure you have the latest revision of the manual or to obtain the illustrated parts catalog, please visit the Bunn-O-Matic website, at www.bunn.com. This is absolutely FREE, and the quickest way to obtain the latest catalog and manual updates. Contact Bunn-O-Matic

Corporation at 1-800-286-6070 to obtain a paper copy of the required Illustrated Parts Catalog mailed via U.S. Postal Service.

www.bunn.com

BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY

Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:

1) All equipment other than as speciﬁed below: 2 years parts and 1 year labor.

2) Electronic circuit and/or control boards: parts and labor for 3 years.

3) Compressors on refrigeration equipment: 5 years parts and 1 year labor.

4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis: parts and labor for 3 years or 30,000 pounds of coffee, whichever comes ﬁrst. These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the applicable warranty period. This warranty does not apply to any equipment, component or part that was not manufactured by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect, alteration, improper installation or operation, improper maintenance or repair, damage or casualty. This warranty is conditioned on the Buyer 1) giving BUNN prompt notice of any claim to be made under this warranty by telephone at (217) 529-6601 or by writing to Post Ofﬁce Box 3227, Springﬁeld, Illinois 62708-3227; 2) if requested by BUNN, shipping the defective equipment prepaid to an authorized BUNN service location; and 3) receiving prior authorization from BUNN that the defective equipment is under warranty.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of BUNN

are not authorized to make modiﬁcations to this warranty or to make additional warranties that are binding on BUNN. Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and should not be relied upon. If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its exclusive option while the equipment is under warranty, shall either 1) provide at no charge replacement parts and/or labor (during the applicable parts and labor warranty periods speciﬁed above) to repair the defective components, provided that this repair is done by a BUNN Authorized Service Representative; or 2) shall replace the equipment or refund the purchase price for the equipment.

THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AT BUNN’S SOLE OPTION AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND.

In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost proﬁts, lost sales, loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute equipment, facilities or services, or any other special, incidental or consequential damages.

BrewWISE, BUNN Gourmet Ice, BUNN Pour-O-Matic, BUNN, Bunn-OMatic, Bunn-O-Matic, BUNNlink, BUNNserve, BUNN Espress, DBC, Dr. Brew, Dual, EasyClear, EasyGard, Easy Pour, FlavorGard, Gourmet Ice, Gourmet Juice, High Intensity, IMIX, Infusion Series, Legendary for Quality, The Mark of Quality in Beverage Equipment Worldwide, My Café, PowerLogic, Safety-Fresh, Scale-Pro, Single, Smart Funnel, Smart Hopper, Soft Heat, SplashGard, System III, ThermoFresh, 392,AXIOM, Beverage Proﬁt Calculator, Beverage Bar Creator, BrewLOGIC, BrewMETER, BrewWIZARD, BUNNSERVE, BUNNsource, Coffee At Its Best, Cool Froth, Digital Brewer Control, Intellisteam, Nothing Brews Like a BUNN, Pouring Proﬁts, Pulse Wave, Quality Beverage Equipment Worldwide, Signature Series, Silver Series, Smart Heat, SmartWAVE, Tea At Its Best, The Horizontal Red Line, Titan, Ultra, are either trademarks or registered trademarks of Bunn-O-Matic

Corporation.

INTRODUCTION

This equipment will brew one or two half-gallon batches of coffee simultaneously into awaiting dispensers with just the press of a button. One side may include a hot water faucet for allied beverage use. Most functions of the brewer are digitally controlled. It is only for indoor use on a sturdy counter or shelf.

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CONTENTS

This equipment must be installed to comply with the International Plumbing Code of the International Code Council and the Food Code Manual of the Food and Drug Administration (FDA). For models installed outside the U.S.A., comply with the applicable Plumbing /SanitationCode.

Introduction & Warranty .....................................................................................2

User Notices .......................................................................................................3

Electrical & Plumbing Requirements ...................................................................4

Operating Controls ..............................................................................................5

Initial Set-Up, Coffee Brewing, & Cleaning ..........................................................6

Adjustments & Optional Settings ........................................................................7

Adjusting Brew Volumes & Water Sensing Threshold Adjustment ......................8

Pulse Brew Setup Procedure ...............................................................................9

Troubleshooting ................................................................................................10

Diagnostics .......................................................................................................20

Service ..............................................................................................................21

Wiring Diagrams ...............................................................................................30

USER NOTICES

Carefully read and follow all notices in this manual and on the equipment. All labels on the equipment should

be kept in good condition. Replace any unreadable or damaged labels.

#37881.0000

#00658.0000

#29007.0000

#00656.0000

#00986.0000

#03408.0002

#28694.0000

#12364.0000

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#03409.0002

36672 020708

ELECTRICAL REQUIREMENTS

GREEN GREEN

CAUTION - The brewer must be disconnected from the power source until speciﬁed in Initial Set-Up.

RED

WHITE

NEUTRAL

BLACK

120 V.A.C.

208 or 240 V.A.C.

Note: This electrical service consists of 3 current carrying conductors (Neutral, L1 and L2) and a separate conductor for earth ground.

Refer to Data Plate on the Brewer, and local/national electrical codes to

120/208 and 120/240 volt ac models

determine circuit requirements.

Electrical Hook-Up CAUTION – Improper electrical installation will damage electronic components.

1. An electrician must provide electrical service as speciﬁed.

2. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.

3. Remove the front panel beneath the sprayhead.

4. Feed the cord through the strain relief and connect it to the terminal block(s).

5. Connect the brewer to the power source and verify the voltage at the terminal block(s) before proceeding.

Replace the front panel.

6. If plumbing is to be hooked up later be sure the brewer is disconnected from the power source. If plumbing

has been hooked up, the brewer is ready for Initial Set-Up.

PLUMBING REQUIREMENTS

These brewers must be connected to a cold water system with operating pressure between 5 and 90 psi (34.5 and 620 kPa) for CDBC models. A shut-off valve should be installed in the line before the brewer. Install a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345 kPa). The water inlet ﬁtting is 3⁄8" ﬂare. Bunn-O-Matic does not recommend the use of a reverse-osmosis or deionized water supply to this equipment.

NOTE - Bunn-O-Matic recommends 3⁄8" copper tubing from a 1⁄2" or larger water supply line. A tight coil of cop- per tubing in the water line will facilitate moving the brewer to clean the countertop. Bunn-O-Matic does not recommend the use of a saddle valve to install the brewer. The size and shape of the hole made in the supply line by this type of device may restrict water ﬂow.

This equipment must be installed to comply with the International Plumbing Code of the International Code Council and the Food Code Manual of the Food and Drug Administration (FDA). For models installed outside the U.S.A., you must comply with the applicable Plumbing/Sanitation Code for your area.

Plumbing Hook-Up

1. Flush the water line.

2. Securely attach it to the ﬂare ﬁtting at the rear of the brewer.

3. Turn on the water supply.

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OPERATING CONTROLS

CDBCA

ENABLE

ON / OFF

BREW

WARMER WARMER

ENABLE

ON / OFF

BREW

WARMER

CAUTION

FAILURE TO COMPLY RISKS INJURY

A) ENABLE BREW ON/OFF SWITCH

Pressing the "ON/OFF" switch (indicator glowing) supplies power to the brew station warmer, enables the brew circuit, and energizes the tank reﬁll circuit. Pressing the switch again (indicator not glowing) stops tank reﬁlling, brewing and deenergizes the brew station warmer. Stopping a brew cycle after it has been started will not stop the ﬂow of water into the decanter/server until the funnel is empty.

NOTE – Hot water will be available at the faucet in a limited amount when the "ON/OFF" indicator is not glowing because the tank will not reﬁll.

(B) BREW SWITCH

Momentarily pressing and releasing the switch starts a brew cycle when the "ON/OFF" indicator is glowing.

NOTE – The "ON/OFF" indicator must be glowing to initiate and complete a brew cycle.

P1869

Pressing any additional warmer switch so the indicator is glowing, supplies power to associated warmer.

(D) READY INDICATOR

This indicator glows when the preset temperature has been achieved. The word "NOT" above "READY" will

glow in all other instances.

(E) MAIN ON/OFF SWITCH

This switch, located on the left side of the brewer, turns power on and off to all components in the brewer.

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INITIAL SET-UP

1. Insert an empty funnel into the funnel rails of one of the brew stations.

2. Place an empty decanter/server under the funnel.

3. Connect the brewer to the power source.

4. Press the "ON/OFF" switch (indicator glowing).

5. Water will ﬂow into the tank and stop when the tank is ﬁlled to its capacity.

6. Wait approximately twenty minutes for the water in the tank to heat to the proper temperature.

7. Place a small vessel beneath the faucet and open the faucet handle. Release it when you hear water once again

ﬂowing into the tank.

8. With the "ON/OFF" switch still in the "ON" position (indicator glowing), momentarily press and release the "BREW"

switch.

9. Allow the cycle to ﬁnish and measure the amount of water in the decanter/server. It should be 64 ounces ± 2. Refer

to the adjustments section of this manual should the volume need to be increased or decreased.

NOTE: Repeat steps 1 through 9 for the other brew station.

The brewer is now ready for use in accordance with the coffee brewing instructions below.

COFFEE BREWING

1. Insert a BUNN ﬁlter into the funnel.

2. Pour the fresh coffee into the ﬁlter and level the bed of grounds by gently shaking.

3. Slide the funnel into the funnel rails.

4. Place an empty decanter/server beneath the funnel.

5. Press the "ON/OFF" switch (indicator glowing), then momentarily press and release the "BREW" switch.

6. When brewing is completed, simply discard the grounds and ﬁlter.

CLEANING

1. The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all surfaces

on Bunn-O-Matic equipment.

2. Check and clean the sprayhead. The sprayhead holes must always remain open.

CLEANING

1. The use of a damp cloth rinsed in any mild, nonabrasive, liquid detergent is recommended for cleaning all surfaces

on Bunn-O-Matic equipment.

2. Check and clean the sprayhead. The sprayhead holes must always remain open. Insert the short end of the spray-

head cleaning tool into each of the ﬁve water outlets of the plastic sprayhead to remove any mineral deposits.

3. Insert the long end of sprayhead cleaning tool into the sprayhead ﬁtting, and rotate several times to remove any

mineral deposits from the ﬁtting.

NOTE: In hard water areas, this may need to be done daily. It will help prevent liming problems in the brewer and takes

less than a minute.

NOTE: In the event that the "Brew Logic" circuit activates (compensating for high lime build up), it will temporarily disable

the "Recovery Booster" and "Pulse Brewing" systems until the unit has been de-limed. Refer to the Troubleshooting section for more details.

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ADJUSTMENTS & OPTIONAL SETTINGS

ENABLE

ON / OFF

BREW

WARMER WARMER

ENABLE

ON / OFF

BREW

WARMER

HIDDEN

SWITCH

HIDDEN

SWITCH

P1871

NOTE: The following adjustments must be performed for each Brew Station.

Setting Brew Temperature

The brewer is factory set to brew at 200°F(95°C). To change this setting, press and hold the "HIDDEN" switch beneath the "®". The word "TEMP" above the "ON/OFF" switch will glow to correspond with the temporary function change of this switch. Repeatedly press and release the "ON/OFF" switch until one of the bank of temperature indicators shows the approximate desired temperature. When two indicators are glowing, the temperature is approximately the number between them.

Setting Brew Lockout

The brewer is factory set with the brew lockout disabled. Brew lockout prevents starting a brew cycle if the ready indicator is not glowing. When an attempt at brewing cannot be allowed, the word "NOT" and "LOCKOUT" ﬂash for three seconds to indicate the reason the brew can't begin. To change the condition of the brew lockout, press and hold the "HIDDEN" switch beneath the "®" and momentarily press the "BREW" switch.

Adjusting Automatic Warmer Shut-Off

The brewer is factory set with this feature disabled. The automatic warmer shut-off deenergizes all warmers after a predetermined time period after the most recent brew cycle. To change the setting, press and hold the "BREW" switch and the "HIDDEN" switch beneath the "®" for ﬁve seconds, the entire bank of temperature indicators will ﬂash on-and-off. Release both switches. Pressing and releasing the "BREW" switch will select the number of temperature indicators from none to ﬁve. When no indicators are glowing, this feature is disabled and all warmers will be controlled only by their respective switches. When one to ﬁve indicators are glowing, it indicates the approximate number of hours of delay before all warmers will be automatically deenergized after the most recent brew cycle.

IMPORTANT: The tank must be full and reﬁll solenoid shut off prior to making these adjustments. Sprayhead must be installed while making these adjustments.

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ADJUSTING BREW VOLUMES

The brewer is factory set to deliver 64 ounces ± 2 for each brew cycle.

BREW VOLUME SET-UP: Use the following steps when the setting is unknown or a different circuit board is being installed.

1. Place an empty funnel in the funnel rails and an empty decanter/server or graduated vessel beneath the funnel.

2. Press the "ON/OFF" switch (indicator glowing).

3. Press and hold the brew start button until you hear the brew solenoid click on-and-off three times (approximately 10 seconds). Release the button.

4. Allow the cycle to continue until the desired amount of water is dispensed and then turn "OFF" the brewer.

The brewer is now set to dispense this amount of water for each subsequent brew cycle.

To increase the amount of water for each brew cycle place an empty funnel in the funnel rails and an empty

decanter/server or graduated vessel beneath the funnel. Press the "ON/OFF" switch. Press and hold the "BREW" switch until you hear the solenoid click on-and-off three times (approximately 10 seconds), then release the "BREW" switch. Momentarily press and release the "BREW" switch once for each ounce (approximate) of water to be added to the prior setting and allow the brew cycle to ﬁnish.

To decrease the amount of water for each brew cycle place an empty funnel in the funnel rails and an empty

decanter/server or graduated vessel beneath the funnel. Press the "ON/OFF" switch. Momentarily press and release the "BREW" switch once for each ounce (approximate) of water to be removed from the existing setting. Press and hold the "BREW" switch until you hear the solenoid click on-and-off three times (approximately 10 seconds), then release the "BREW" switch and allow the cycle to ﬁnish.

WATER SENSING THRESHOLD ADJUSTMENT PROCEDURE

1. Make sure the tank is full of water to be used for calibration. The water must be in contact with the reﬁll probe.

2. Unplug the brewer from the power source, then press and hold the BREW button while power is reapplied.

3. Continue pressing the BREW button until the READY indicator begins to ﬂash. Release the BREW button and then press it again momentarily.

4. The new calibration is automatically completed within a few seconds. If the water is too pure for use with the brewer, the READY indicator will ﬂash very rapidly and the old calibration will be retained.

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PULSE BREW SETUP PROCEDURE

The pulse brew parameters (initial ﬁll time, off times, and remaining on times) are entered using the following set-by-example process.

1. First set the brew volume using the standard procedure in Brew Volume Setup.

2. Position an empty container under the sprayhead. Allow the tank to ﬁnish reﬁlling. Make sure that the READY

lamp is on, or that the BREW LOCKOUT function is turned off.

3. Press and hold the "ON/OFF" button. The brew valve will turn on after 10 seconds. Release the button. This

begins the initial on-time setting. When the spray has continued for the desired time, momentarily press the "ON/OFF" button.

4. The spray is now stopped and the off time setting has begun. Press the "ON/OFF" button momentarily to end

the off time.

5. The spray is now on again and the remaining on time setting has begun. Press the "ON/OFF" button momen-

tarily at the end of the desired remaining on time.

6. The setup is now complete and the parameters are stored in memory. The spray will continue the off and

on cycles until the brew volume of step 1 is complete. Pressing the "ON/OFF" button again will terminate the brewing cycle, with the parameters stored in memory.

7. If only a preinfusion is desired, i.e. an initial on time followed by one off period, use the same procedure, but

stop after step 4 and allow the brew to ﬁnish the volume set in step 1. This will store the initial on time and off time in memory.

Procedure for Disabling Pulse Brew or Preinfusion:

1. Position an empty container under the sprayhead. Allow the tank to ﬁnish reﬁlling. Make sure that the READY

lamp is on, or that the BREW LOCKOUT function is turned off.

2. Press and hold the "ON/OFF" button. The brew valve will turn on after 10 seconds. Release the button.

3. Allow the spray to continue and press no buttons until spray stops. The pulse and preinfusion functions are

now disabled. NOTE: When the brewer has been set up for pulse or preinfusion, the adjustment of brew volume is done the same as always and has no effect on the pulse brew parameters. The pulsing is temporarily disabled while adjusting the brew volume and automatically returns during normal brewing.

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36672 030104

TROUBLESHOOTING

A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems

encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic Technical Service Department.

• Inspection,testing,andrepairofelectricalequipmentshouldbeperformedonlybyqualiedservicepersonnel.

• Allelectroniccomponentshave120voltacandlowvoltagedcpotential on their terminals.  Shorting of

terminals or the application of external voltages may result in board failure.

• Intermittentoperationofelectroniccircuitboardsisunlikely.Boardfailurewillnormallybepermanent.If

an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a terminal or crimp.

• Solenoidremovalrequiresinterruptingthewatersupplytothevalve.Damagemayresultifsolenoidsare

energized for more than ten minutes without a supply of water.

• Theuseoftwowrenchesisrecommendedwheneverplumbingttingsaretightenedorloosened.Thiswill

help to avoid twists and kinks in the tubing.

• Makecertainthatallplumbingconnectionsaresealedandelectricalconnectionstightandisolated.

• Thisbrewerisheatedatalltimes.Keepawayfromcombustibles.

WARNING – • Exerciseextremecautionwhenservicingelectricalequipment.   • Unplugthebrewerwhenservicing,exceptwhenelectricaltestsarespecied.   • Followrecommendedserviceprocedures.   • Replaceallprotectiveshieldsorsafetynotices.

Before troubleshooting this brewer, check for the following:

A. Control Boards Make sure ribbon cable is properly attached to the control board (ALL PINS INSERTED INTO PLUG). Make sure there is a nylon insulating washer under each screw head that holds the control board to the plastic

front end cap. This is important for proper operation.

B. Make sure before servicing brewer that voltage is present at control board.

Press any warmer switch or observe if any indicator lights are glowing on the control panel. If so, proceed

with testing. If not, check for voltage across pins 1 & 2 of the ten pin J1 connector (black and white wires). If voltage is present, replace the control board. If voltage is not present, check wiring and voltage across terminal block(s) (black and white). Correct the problem and retest before proceeding with testing.

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36672 030104

TROUBLESHOOTING (cont.)

REFILL CIRCUIT

PROBLEM

Will not ﬁll or reﬁll

PROBABLE CAUSE REMEDY

1. Power off to brewer

Press ON/OFF switch on control panel to determine if power is "ON".

2. Water shut off

3. Display ﬂashing

Make sure water is ON.

Brewer has shut down due to malfunction (See Diagnostic Chart in manual, Page 20, or under top lid of brewer).

4. ON/OFF Switch

Make sure ON/OFF Switch is "ON" and indicator is lit.

5. Lime build up on Probe

Remove the Probe and check for lime deposit on tip. Clean and reinstall.

6. Reﬁll Valve or Control Board

Disconnect the brewer from the power source and remove wires from reﬁll valve coil. Check for continuity across the terminals of the solenoid coil. If continuity is not present, replace the reﬁll valve (See page 28). If continuity is present, the coil may be stuck closed. Shut water off to brewer. Set the ON/OFF switch to the "OFF" position. Open the faucet and drain water down in the tank until ﬂow stops or slows to a trickle. Attach a voltmeter to the terminals of the reﬁll solenoid. Connect the brewer to the power source. Press the switch "ON". Within ﬁve seconds, voltage should be present at the solenoid terminals. If voltage is not present, refer to the wiring diagrams and check the wiring harness.

Fill or reﬁll does not shut "OFF" (ON/OFF Switch "ON")

7. Water is too conductive for proper operation when using the factory setting of sensing threshold

1. Lime build up on probe

Page 11

Reset the Water Sensing Threshold Adjustment Procedures on page

Remove Probe and check for lime deposits on tip. Clean and reinstall.

36672 030104

+ 24 hidden pages

Bunn Coffee Maker CDBC-TWIN-APS Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual